<template>
  <div class="app-container">
    <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name"/>
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" controls-position="right" />
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level" clearable placeholder="请选择">
          <!--
            数据类型一定要和取出的json中的一致，否则没法回填
            因此，这里value使用动态绑定的值，保证其数据类型是number
          -->
          <el-option :value="1" label="高级讲师"/>
          <el-option :value="2" label="首席讲师"/>
        </el-select>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career"/>
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro" :rows="10" type="textarea"/>
      </el-form-item>

      <!-- 讲师头像：TODO -->
      <el-form-item label="讲师头像">

          <!-- 头衔缩略图 -->
          <pan-thumb :image="teacher.avatar"/>
          <!-- 文件上传按钮 -->
          <el-button type="primary" icon="el-icon-upload" @click="imagecropperShow=true">更换头像
          </el-button>

              <!--
          v-show：是否显示上传组件
          :key：类似于id，如果一个页面多个图片上传控件，可以做区分
          :url：后台上传的url地址
          @close：关闭上传组件
          @crop-upload-success：上传成功后的回调 -->
          <image-cropper
                        v-show="imagecropperShow"
                        :width="300"
                        :height="300"
                        :key="imagecropperKey"
                        :url="BASE_API+'/eduoss/fileoss/upload/avatar'"
                        field="file"
                        @close="close"
                        @crop-upload-success="cropSuccess"/>
      </el-form-item>
      <el-form-item>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdate">保存</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>
<script>
import teacherApi from '@/api/edu/teacher'
import ImageCropper from '@/components/ImageCropper'
import PanThumb from '@/components/PanThumb'
export default {
  components: { ImageCropper, PanThumb },
  data(){
    return {
      teacher:{
        avatar:'https://online-teach-file.oss-cn-beijing.aliyuncs.com/teacher/2019/11/08/e44a2e92-2421-4ea3-bb49-46f2ec96ef88.png'
      },
      avatar:"https://online-teach-file.oss-cn-beijing.aliyuncs.com/teacher/2019/11/08/e44a2e92-2421-4ea3-bb49-46f2ec96ef88.png",
      saveBtnDisabled:false,
      imagecropperShow:false,
      BASE_API:process.env.BASE_API,
      imagecropperKey: 0
    }
  },
  watch: {
     $route(to, from) {
        this.init()
     }
  },
  created(){
    this.init()
  },

  methods:{
     init(){
      // 固定写法，如果参数中id值不为空
      if(this.$route.params && this.$route.params.id){
        const id = this.$route.params.id
        this.queryTeacherById(id)
      }
    },
    close(){
      this.imagecropperShow = false
      this.imagecropperKey = this.imagecropperKey +1
    },
    // 头像上传成功后的回调函数，自动把返回的数据封装到参数中
    cropSuccess(resp){
      this.imagecropperShow=false
      this.teacher.avatar = resp.url
      // 上传成功后，重新打开上传组件时初始化组件，否则显示上一次的上传结果
      this.imagecropperKey = this.imagecropperKey + 1
    },
    queryTeacherById(id){
      teacherApi.queryTeacherById(id)
      .then(response=>{
        this.teacher = response.data.teacher
      })
    },
    // 更新或者是添加
    saveOrUpdate(){
      if(this.teacher.id){
        
        this.updateById(this.teacher)
      }else{
        this.saveTeacher(this.teacher)
      }
    },
    saveTeacher(teacher){
      teacherApi.saveTeacher(teacher)
      .then(response=>{
          this.$message({
            type: 'success',
            message: '添加成功!'
          })
          this.$router.push({path:'/teacher/table'})
      })
    },
    updateById(teacher){
      teacherApi.updateTeacher(teacher)
      .then(response=>{
        this.$message({
            type: 'success',
            message: '修改成功!'
        })
        this.$router.push({path:'/teacher/table'})
      })
    }
  }
}
</script>